As a builder, you did everything right. Bill 44 gave you the zoning. Your design works, the units are sized well, the pro forma pencils. Then the servicing conversation happens— and the electrical connection turns out to cost far more than you budgeted, or worse, forces a piece of equipment onto your lot you never planned for.
Of all the costs in a gentle density project, the electrical service is one of the easiest to underestimate and one of the hardest to fix late. It hides behind the design work, surfaces during utility coordination, and by the time it does, your options have narrowed and your budget is set. The good news: it can be a predictable cost — if you know what triggers it.
This piece is about seeing it coming and designing around it.
Why gentle density hits the electrical wall
The math is simple. A lot that used to carry one house — often with a gas furnace, gas water heater, and a gas range — now carries three, four, or even six units. In a high-performance, low-carbon build, those units are usually all-electric: heat pumps for space heating and cooling, heat-pump water heaters, induction cooking, and increasingly EV charging. Every one of those loads either used to be gas or didn’t exist. Now they’re all on the panel, and several can run at once.
That’s where a key distinction comes in: calculated load versus actual load.
- Your calculated (or design) load is the number the electrical code and your utility use to size your service — a deliberately conservative sum of everything that could draw power.
- Your actual load is what the building will realistically pull at any given moment, which is almost always far lower, because you’re rarely heating every unit while charging the car, running the dryer, and cooking dinner all at the same exact moment.
The gap between those two numbers is the whole game. A high calculated load forces a bigger, more expensive service — but because the calculation is conservative, there are legitimate ways to bring it down. More on that below.
The amperage ladder: 200, 320, or 400
Residential service in BC steps up in tiers, and each step up costs more: a bigger service entrance, a larger panel, and potentially utility-side work.
For many gentle density projects, the numbers are more forgiving than people expect. A fully electric home with a secondary suite and EV charging can usually run on a standard 200-amp service — but only if you actually run the load calculation to confirm it. Don’t assume; calculate.
Where you get pushed up the ladder is with heavier loads: luxury or high-draw appliances, or more than two units on the property. These can push you toward a 400-amp service, which is a meaningful cost jump.
The step worth knowing about sits in between. BC Hydro introduced a 320-amp service that can be the difference between a manageable upgrade and a full jump to 400. If your calculated load creeps just past 200, 320 may carry you without the cost and complexity of the top rung. It’s the most underused option on the ladder.
The real villain: the transformer trigger
Here’s the cost most people don’t see coming — and it isn’t your panel.
Your service size is one question. A separate, bigger question is whether the existing utility infrastructure on your street can actually deliver the power your project needs. Homes are typically fed from a shared transformer sized for the loads of the original houses. Stack several all-electric units onto that transformer and you can exceed what it was built to carry.
When that happens, the utility requires a transformer upgrade — and for the loads typical of a multiplex, that often means a pad-mounted transformer (PMT): a utility transformer that sits on a concrete pad on your lot rather than up on a pole.
A PMT is a double hit. First, the cost. Second — and often worse on a tight infill lot — the space. A PMT needs ground area, clearances and setbacks from the building, and clear fire-department access.
On a lot where you’re already fighting for every square foot of livable and developable area, a transformer pad can force real compromises in your design, or land in a spot that undercuts the whole site plan. That’s why a PMT is best avoided wherever possible: it isn’t just a line item, it’s a constraint on the building itself.
So the critical question isn’t only “what size service do I need?” It’s “will my load trigger a transformer upgrade?” — because that’s the answer that reshapes both your budget and your site plan.
Staying off the expensive rung
If your project is close to a tier line, or close to triggering a transformer, you have more control than you might think. Because the calculated load is conservative by design, the right moves can pull it back under the threshold.
Three levers do most of the work:
- Specify low-load appliances. Swapping a conventional electric dryer for a ventless or heat-pump dryer meaningfully cuts calculated demand. In some projects this alone is the difference between staying on a 200-amp service and paying for an upgrade.
- Use automated load management tools. Load splitters, circuit pauses, and smart panels — particularly for EV charging — can reduce the calculated load by up to roughly 40 amps per unit. On a multi-unit project that’s a large gain, and it’s often the single most effective tool for staying off the next rung.
- Manage peak demand actively. Load management allows you to focus on your active electrical demand at any time of day. However, thinking about when you need that load can be just as helpful. Smart panels and monitoring can hold EV charging until other high-draw appliances (oven, laundry) are off, or only allow charging when capacity is free. The car still charges — it just doesn’t stack onto your peak hours.
None of these require exotic equipment or specialty consultants. They’re specification and coordination decisions, which means they’re cheapest to make early, in design.
The municipal wildcard
One more variable sits outside your building entirely: the jurisdiction you’re building in. How electrical servicing, load calculations, and utility coordination get handled varies from municipality to municipality — and some make this far easier than others.
Bill 44 has shifted a lot of previous assumptions, and not every local process has caught up. Municipalities that require or encourage early load calculations and early utility coordination tend to surface these issues while they’re still cheap to solve; those that don’t leave builders to discover them late.
Do these three things now
The electrical service is predictable if you treat it as a design input, not a late discovery.
Three moves, in order:
- Engage the utility early. Before the design is locked, get the electrical requirements on the table. This is often left to the builder — but it lands directly on the design, so the design team has to make sure it happens.
- Run the load calculation before you finalize. The calculation tells you which rung of the ladder you’re on and whether you’re near a transformer trigger, while you can still do something about it.
- Request a pre-clearance letter (where offered by your utility). Ask the utility to if they are able to confirm in writing that a PMT is not required. It de-risks the project and streamlines later approvals. This may mean longer timelines to ensure you are asking about the turnaround time for a letter.
Get these three done up front, and the electrical connection stops being the thing that surprises your pro forma. It becomes one more part of the design you actually controlled.